Rock or well drilling machine



(No Model.)

' 0. HARMAN.

ROCK OR WELL DRILLING MACHINE.

No. 372,143. Patented Oct. 25, 1887.v

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UNITED STATES PATENT OEErcE.

CHARLES HARMAN, OF TIFFIN, OHIO.

, ROCK 0 WELL DRILLING MACHINE.

SPESJIFICATION forming part of Letters Patent No. 372,143, dated October25, 1887.

Application filed Ap2il J3, 1887. Serial No. 235,910.

To all whom it may concern.-

Be it known that 1, CHARLES HARMAN, of Tiffin, in the county of Senecaand State of Ohio, have invented certain new and useful Improvements inRock or Well Drilling Machines; and I do hereby declare the following tobe a full, clear, and exact description of of the invention, such as.will enable others skilled in the art to which it pertains to make anduse the same.

My invention relates to improvements in rock-drilling apparatus; and itconsists in cer tain features of construction and in combina tion ofparts hereinafter described, and pointed out in the claims.

In the accompanying drawings. Figure l is a side elevation of myimproved drilling-inachine. Fig. 2 is a front end elevation of the Fig.3 is a rear end elevation. Fig. 4 is a front end elevation with theclutch mechanism removed, the clutch-levers showing in Fig. 5 is a planView. 1

A represents a suitable supporting-base, to which is rigidly attached anupright bar, B, the edges of the latter serving as ways for thevertically-reciprocating cross-head O.

D is the driving-shaft, the same being journaled in suitable boxesconnected with the base. This shaft is provided with a driving-pulley,

D, or with other mechanism for transmittingpower to the shaft. Mountedon the other end of the shaft is the crank D", the latter beingconnected by pitman d with a cross-head, O, for reciprocating thelatter. The cross-head has gibs O, of considerable length, to give amplewearing-surface and to insure a steady movement of the crosshead on theways as against a rocking tendency of the cross-head. The ends of thecross-head extend outside of the line of the gibs. These projecting endsare slotted, forming jaws c, for receiving, respectively, horizontallevers E, bolts or-pins 0 being made to extend through the respectivelevers E and the embracing-jaws 0, such bolts or pins forming fulcrumsfor thelevers. These levers at the front end terminate in heads E, forholding the clamping-jaws F. These jaws on their inner faces are groovedlengthwise to approximately fit the drill-rod G, and on their outerfaces have ribs f, inclined, as shown, to the inner faces of the jaws.These ribs in cross-section are preferably T-shaped and optheir normalposition.

(No model.)

crate in correspondingly-shaped and inclined grooves 6, made in theheads E, as shown in Figs. 2 and 5. With the heads E held stationary, itis evident that by reason of the inclined ways f thejaws F may be madeto ap proach or recede from'each other by depressing or elevatingthesejaws.

Springs f are located substantially as shown in Fig. 2, and areconnected, respectively, with heads E, and engaging-jaws F, to hold thelatter in their normal or elevated position, with the center of thejawssomewhat above the center of the heads. These heads, when made toapproach each other by the operation of a toggle-j oint located at therear end of the levers E, and hereinafter described, close the jaws Fsufficiently with the latter in their normal or elevated position tograsp and elevate a drillrod ofmoderate length. If, however, thedri1lrod in drilling deep holes has been lengthened and its weightthereby increased, so that the grasp of thejaws,with thelatter in theirnormal position in the heads,will not elevate the drill-rod, the jaws,as the cross head commences its upward movement, slide down ward in theheads E, and by reason of the inclined ways f the jaws are wedgedagainst the drillrod with a force greater or less, according to theweight of the latter, but always sufficient to preclude the possibilityof the drill-rod slip ping between thesejaws. hen thejaws have opened bythe collapse of the togglejoint aforesaid, the spring f at once elevatesthejaws to The said toggle-joint and connected mechanism are as follows:H is an upright rod located midway between the levers E and near therear end of the latter. The rodis rigidly secured to the bed. The upperand lower portions of the rod are screwthreaded, and provided with jam-nnts or'tappets h and h, the latter being screw-threaded, making themadjustable lengthwise of the rod. These tappets form abutments for thesleeve I, the latter being made to slide on the rod H.

To opposite ends of this sleeve are jointed bearings i, that are seatedin corresponding sockets, 0, made on the inner faces of the levers E.

Near the lower end of the downstroke of the cross-head the sleeve Istrikes the tappets h, after which, as the cross-head descends a littlefarther, the arms 1', by their engagement with the levers E, are tilteddownward and brought in line with each other, such distention of thearms iof course causing an outward movement of the engaging end of thelevers E, thereby causing the forward ends of these levers to approacheach other, causing the jaws F to grip the drill-rod. In this positionof parts the drill-rod is elevated with the cross-head. Near the end ofthe upward movement of the crosshead the sleeve I strikes the tappet h,causing the arm 2' to be tilted to the inclined position shown in dottedlines, Fig. 3, the rear ends of the levers being drawn toward each otherby the tension of the spring J, the latter being located just inside theline of the togglejoint in position extending from one lever E to theother, and being attached to both levers. WVith this construction thetension of the spring J prevents lost motion of the parts. as wouldotherwise occur from wear in case the leversE were moved in bolhdirections by the action of the toggle-joint.

In operating the machine, by revolving the shaft 1) the cross-head O isreciprocated, and by means of the mechanism hereinbefore described thedrill is lifted with the upward movement of the crosshead and allowed tofall by gravity when the cross head has reached the end of its upstroke.

\Vhat I claim is 1. The combination, with a vertically-reciprocatingcross-head and suitable crank and pitman for operating the same, ofhorizontal levers pivoted to the crosshead, said levers having jawsmounted thereon for grasping the drill-rod, a toggle-joint for operatingthe said levers, and tappets arranged above and below the togglejointfor operating the latter, substantially as set forth.

2. The combination, with a vertically-reciprocating cross-head, leverspivoted to the crosshead, and toggle-j oints for operating the levers,substantially as indicated, of jaws mounted on the said levers, the saidjaws having inclined ways made to operate in corresponding ways in therespective heads of the levers, the ways of a pair of jaws being made toconverge as they extend downward, substantially as set forth.

3. The combination,withacross-head,lcvers pivoted to the cross-head, andjaws mounted on the levers for grasping the drill-rod, the parts beingarranged substantially as indicated, of a toggle-joint for pressing oneend of thelevers outward and aspring connected with the levers and madeto act in apposition with the thrust of the togglejoint, substantiallyas set forth.

4. The combination, with a vertically-reciprocating cross-head, lateralarms pivoted to the cross-head, jaws mounted on the levers for graspingthe drill-rod, and a toggle joint for operating the levers,substantially as indicated, of a sleeve connected with the togglejointand made to slide on an upright stationary rod, and adjustable tappetsmounted on the rod for engaging the sleeve to operate the togglejoint,substantially as set forth.

5. The combination, with cross-head, levers, toggle-joint, and mechanismfor operating the latter, substantially as indicated, of jaws mounted onthe said levers for grasping the drill-rod, said jaws having inclinedways converging downward, said ways being made to operate incorresponding grooves of thelcverheads, springs connected with therespective lever-heads, and engaging-jaws to hold the latter, when free,in their normal or elevated position, substantially as set forth.

In testimony whereof I sign this specificatiou, in the presence of twowitnesses, this 5th day of March, 1887.

CH ARLES HARMAN.

Witnesses:

WM. HARMAN, W. H. BLASIUS.

